We have a 1534 controlling 6-7 AP 160s. Most of them are rebooting about once an hour. Only pattern we can find is they are on remote 1238s and we have Dell laptops connected and it appears if they Dell laptops have wired and wireless connection on at same time they trigger the event. It sounds weird, but that is closes thing to a pattern we can find. One device does not do it, but is connected to the 1534 that controls all the APs.